An open-pore MFI zeolite nanosheet-modified separator with Li-ion flux regulation for lithium-metal batteries

Abstract

Separator modification has become one of the most facile and promising methods to inhibit Li dendrite formation. Herein, an open-pore MFI zeolite nanosheet-modified polyacrylonitrile (open-pore MFI NSs@PAN) separator was prepared via the combination of vacuum filtration and the electrospinning technique. The straight channels in the MFI NSs, the fluid channels formed by the stacking of the MFI NSs and the interconnected network channels formed by the interweaving of the PAN nanofibers jointly constructed a micro/nano pore structure, which provides sufficient Li⁺ transport channels and enables uniform Li⁺ flux. Consequently, the open-pore MFI NSs@PAN separator-based cell delivers a stable and uniform Li deposition, demonstrating a more stable cycle-life and better rate capability. Redistributing Li⁺ flux through straight channel zeolite nanosheets provides a powerful method for suppressing Li dendrites, presenting enormous potential for promoting the commercial application of lithium metal batteries.